The billionaire said he would “err on the side of security" during an interview on MSNBC's "Morning Joe" Monday, a day after new National Security Agency (NSA) reforms went into place.

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“Every time I pick up a phone, I assume people are listening to my conversations,” added Trump, the GOP front-runner. “I don’t like it, but I have to make that assumption. I would really much err on the side of security. As a lot of people would agree with me on that.”

Trump’s comments come amid a growing NSA debate within the Republican Party that has splintered the party’s hawks from its civil liberties advocates.

Rubio has launched a heated campaign to hit Sen. Ted Cruz (R-Texas) for his support of the new NSA restrictions, which went into effect on Sunday. Cruz and Sen. Rand Paul (R-Ky.) helped to weaken national security by pushing to end the NSA’s controversial collection of millions of Americans’ phone records, Rubio has claimed.

“I've been there from the beginning,” Trump insisted on Monday morning. “I’ve been there from before the Paris attack. After every attack, everybody says exactly this, but I err on the side of security."